Stove pipe joint



Dec. 18, 1934. R. F. TWICKLER STOVE PIPE JOIN'I Filed Sept. 15, 1933 Patented Dec. 18, 1934 UNITED STATES PATENT OFFICE 1 Claim.

The invention relates to stove pipe seams of the slip lock type, and has for its object to provide a device of this character wherein one of the edges of the split pipe is provided with a channel formed integral therewith by a bending operation, and to the inside of said edge, and a shouldered flange carried by the other edge of the split pipe, and adaptedto be forced into the channel until the shoulder of the channel overlies aportion thereof, thereby completing the seam or joint.

A further object is to position the gripping shoulder of the channel in registration with the edge of the split pipe carrying the channel, whereby the shouldered flange of the other edge of the pipe will be positively gripped incident to the spring action of the flange at the seam, thereby preventing spreading of the seam.

A further object is to form the channel substantially rectangular in cross section, and by bending one edge of the split pipe on itself, and to provide an opening in the channel in registration with the edge of the split pipe, and with a flange extending towards the edge of the split pipe in registration therewith and terminating in an outwardly extending flange forming means for stiffening said flange in its gripping operation on the shouldered flange carried by the other edge of the split pipe.

A further object is to provide one edge of the split pipe with a flange having a plurality of bends therein and terminating in a stiffening flange within the channel.

A further object is to provide said stiffening flange with sufficient spring action, which in combination with a spring action in the opposite direction, of one side of the channel, allows the flange to be received within the channel and to assume a locked position in relation to one flange of the channel.

With the above and other objects in view the invention resides in the combination and arrangement of parts as hereinafter set forth, shown in the drawing, described and claimed, it being understood that changes in the precise embodiment of the invention may be made within the scope of what is claimed without departing from the spirit of the invention.

In the drawing:

Figure 1 is a perspective view of the crimped end of a stove pipe, showing the seam applied thereto.

Figure 2 is an enlarged detail perspective view showing the seam in transverse cross section.

Figure 3 is a perspective view of a modified form of seam.

Referring to the drawing, the numeral 1 designates an edge portion of the stove pipe 2, and 3 the other edge. Heretofore in pipe seams there has been a tendency for the seam to open or to be other than straight throughoutits length, incident to lack of pressure of inner parts at the joint, and to obviate this difficulty the present device is primarily designed.

The edge portion 1 has formed integral therewith a substantially rectangular shaped channel 4 formed by bending the flange 5 onto the inner side of the edge portion 1, and forming the chan nel thereon. Channel 4 is provided with an outwardly extending flange 6 in substantial radial alinement with the edge portion 1 and terminates in a stiffening flange 7. It will be noted that by positioning the flange 6 inwardly and in registration with the edge portion 1, the portion 8 of the flange 9, carried by the edge 3, will be positively gripped in overlapping relation with the seam, and by relatively stiff portions carried by the channel and edge portion 1, therefore a positive tight seam is provided, particularly of the slip type. Flange 9 is provided with a shoulder 10 which engages the edge portion 1, as clearly shown in Figure 2, and terminates in an acutely positioned flange 11 within the channel 4, which springs behind the acutely angled shoulder 12 of the channel flange 6 and positively locks the seam against opening, after the flange 9 is forced into the channel. It will be noted that the flange 7 rigidly braces the gripping flange 6 of the channel and stiffens the same so that there is a relatively straight engaging surface on the flange 8. Shoulder 10 is positioned whereby there will be suflicient play for flange 11 to spring into position behind the shoulder 12, and as the channel 4 has spring action, there will be a positive gripping of the flange 8.

Referring to Figure 3 wherein a modified form of slip lock is shown, the flange 8a is provided with reversely positioned right angular portions 13 and 14, and the portion 14 assumes a position within the channel 4 to the rear of the flange 6, thereby positively'locking the seam. In this form the flange 14 terminates in an acutely angled flange 15, which stifl'ens the edge of the pipe and also forms guiding means when the parts are interlocked. In other respects the gripping action of the flange 6 in radial alinement with the edge 1 is the same.

From the above it will be seen that a slip lock seam for stove pipes is provided wherein there is a positive gripping of one edge 01! the pipe between stiffened gripping jaws of a channel formed integral with one edge of the pipe and in radial alinement with one edge oi! the pipe seam, thereby providing a positive stiffened closed seam.

The invention having been set forth what is claimed as new and useful is:

A pipe section comprising a metallic sheet, one margin of which is folded inwardly upon itself to form a folded edge and then refolded defining a channel member and terminating beyond the folded edge, a resilient flange integral with the inner edge of said channel and extend- 

